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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3343aada2775475f1e3c0e5cde91dd62495d24c7d7e1c34b7b6db49f4888c37e' 
  AND token = 'ijTotqIJ1uYtcjZepX7qeQR4C3SGQWc5t75K/MjbmmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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