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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8912dab8bc436ac74c02940bf3ca9c062bd32e24544eb2081e8d89d0e7cfe5ff' 
  AND token = 'YCLVryQVYIbQ++8v9njvRlKI9nf6bOfNqWc5konY6P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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