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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c6369390ebd9f4886a0c3292053a303ad5f4500ec80755d9596c13947d4e44' 
  AND token = 'rdBHUq/+aGpcxK+qUjK3dqagF09wB1aC+KhLcoPCrHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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