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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3966f2f036b62b6cec80fa6aa2b570116cfc362eef2c795aac5af06bbd1c973b' 
  AND token = 'w5G55tS0Ki7AqrL0pBTqBfJ8ioKffss68IlCD+iSCmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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