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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8380d339f159f7ae51c5000ae2e99aeba4625bd0c241b296700af75c296b7c4' 
  AND token = 'lz5ssNfgLKyQ0OiDOG6M4XU0/o0QdQ3goILALQfX9hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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