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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd608af1506b33e2cd2d678e9f0d5d9fe766383377ba7767d2cd2b4e10e60febb' 
  AND token = 'h2881CQcEIDAUJZ9tRHWZlCcStH7CI1slJWsfSLxhKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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