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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69501e2014da6a459d2904949bb6a3dd55125d87781abcf6bdfa74734e4c6391' 
  AND token = 'ujxlWt24Hmhx2sbSGS3x7P856cZzF9DBJuz6nIIed+I=' 
  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"
    }
  }
}