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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c764f63df0fa70ebffcb0f7a17f27cc214cbbc1af22298ac2d6e8164bf68d54d' 
  AND token = 'l9A+o93ywz4w934+0/L64qK1aQXfTNaN34WBwMWrhUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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