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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfaf50bdbb4c3e18b8053a8ff0ea6c4aa4488c3b3ed5d933f522a0b19681a481' 
  AND token = 'zaQJ2ZuiDuo0udiBS8MM47BoyByng1T/pPaZAovR4ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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