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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0391ef5a50f5eac28dd6232d989a8f05d4246d723849aecb01df501e0aba0c' 
  AND token = 'Gb5YVhhMyt8RJ176Qvnf++2wipT+TJE4OniFN4n8wZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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