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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1862e1630896df423d7063b4fd0ca4db2f57616ab914a8103ca01353fe79a6c3' 
  AND token = 'u3tkAfvoBqGcaxXHESzOeu92KXt3yx+yF74wLr977Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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