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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2fb31d6fd7af957e164822596e281f5358ae21c10da0318fbe1aa10cc1fd0a1' 
  AND token = '7i8/AsBglCTDSxIysYcp6bb6YVR1Ql2UfoiBe45xh+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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