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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6dd5a80dc1cbdc1bf9536b40e0204e3a34d04bd876fb8ec3ee1c4ccb9228068' 
  AND token = 'xTyK/dyIGX2BXECXKJ7qmIKjpyOx+quW8ol4Fx923kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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