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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '015abb1670a7d1c67681f3dedb010dd124a1dccfb863c7f80a3829c6bc5209ab' 
  AND token = '9zdk2V9YPl28VkwYhfUFnGsaQUnmPNbizcLyzCR0bqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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