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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d29de6b9eced360602efe684a3af66e29d9332a0c61fadb53f33a1019d41528' 
  AND token = 'LOne565vJBief5B5h+EQf9b+ksSreJT1PFZsqjWMLgM=' 
  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"
    }
  }
}