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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c5bf97b9907b21100a736c599311f14175ed927aee93450bae8e60a991e229' 
  AND token = 'cTkLY5AzsuemcuDlrlfOwy9+mmM7HUWMP8JqcsMqKho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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