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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e518ab7dfc0010cbb09574c58706fce518f9404f1d6dd291efaf1e1a071b38b5' 
  AND token = '0ndJVkf/7wkYl9kOEQHw0zVaksTocyDE0ckRFt9q+bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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