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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a57dc153a55384446f19fc9c7cc757f3cb973cc4fe369a8a541e2555f9a1504' 
  AND token = '5Lp1R5tOgL+6q96heyLTnEKk8HZCLviTujPIOVEtt/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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