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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa5fc42770a0348e01ca838ab766199c247597412d7f1c53859f0732c7dad22' 
  AND token = 'Wh9upQGEoQ50VbomTJyA2QAdGrWwa/yPjUyY634bG2c=' 
  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"
    }
  }
}