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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea122359e3f9f46273e5277daba3a789fd341c18076c7c941bab65319aa9a6cb' 
  AND token = 'lfzRYqUrQf+ELRSfYdpneWcxds8xTH1mpHTk3ad8ZJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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