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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c80a6b8167ece789b0840b7c13b8c682017c7e6e0e0842d6a2b981e083543af3' 
  AND token = 'zBJ6AEcjobtKBXNflnNVxMFWmznyFWKOR2gzkq63Unw=' 
  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"
    }
  }
}