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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e342684f4626a7c26a6745d12ae3d322d6618199bfe6dc72dfd80ec3dfaa6e' 
  AND token = '7I/BoNj0behxP6JsDft1R7hVaSRUjAT4rK4zvDdgNVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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