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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada6077adf3cb18179c9ab550e0e29266e8785146eb5553731da2b410e23f405' 
  AND token = 'z9NSzC1tvg8Kf7cpO2t6J8RseBuaNwgPwyFGl2MJ8Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}