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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df05de79c1e6dd644dcbe34b8d6d35add02c2e66dceb5f18e15b66a4540f4d5e' 
  AND token = 'Djp4c+Tc7CydQJz1Mn51o236UQMai12mfS40VMl2OfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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