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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44fba485d910760fcb6147d33da07d9d2b077df74b1c1104c01527ec2b29fc3' 
  AND token = 'ueuMma08955jKAI2VxGHg3oqGEZmbEt4doMbSdGL/QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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