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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7f71427687bb136427c4235c066c7a1b7b3996dd993c2888025dd75d471dd8d' 
  AND token = 'DIsiYKyHPsxTEfn46d3+5FfLj3bB3GGxo2uflg60LVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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