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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10a4a4944d30cb614d97439cfde2fbbd0cc86ff83e00e061037f031149061924' 
  AND token = 'H3+/pr1si8tWUjDtM/JTVPLow2wp+AXhqumL1VG4nz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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