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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d9934d70d507f29351d46c9b91c89a04b482dac50649a6558ad5c22753be239' 
  AND token = '57qvDcXAq38TP4IRUNZmubqJ+wtdEJR8wkMgWF/lhX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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