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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19df6cb8df37c38f7061edac956167040268e4617ebdf55f67f46cf28c4ea507' 
  AND token = '5c3eV5V6X/CM7GpdK4sRPD+4Q1pNwu5lXpPqJDZkSjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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