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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ff6ad1e142d381378563a9f2b080f4a0f6ea00edd9cf1a751d3fb24930b9ca' 
  AND token = '3gQ+VN/RRW9dHuGDCScb7ZlJNp6SMHxbXffPEk5rQeA=' 
  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"
    }
  }
}