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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4a3485e7b35317c830671f3baf2c28ebb4f69af10779540c0b387d63833ecc' 
  AND token = 'F8DkSiTW5ezjg1i2Qtyrzro+t4wjKPVOH5+WK4tSKeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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