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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5643758a3ee455de52a601fd72cf3cad449d0b5df90aba535fac01c4d8375526' 
  AND token = 'Ikya29J/cnE/+Z9YJN/pr7Wam30DNgmWG3mBW9J01Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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