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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f79bcef4e53d658148fe3c7b7c0015805d9d4b1a2a3b034fdc9b5ccc8ab8d417' 
  AND token = 'w8I3F7Gf1CTYrt85gNdJV/PxcZG7WGGt/68dHCzFRac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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