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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '348700a9c32dad8e3473e2a1688b1045c20b10af8ff913df594747837a28bc1d' 
  AND token = 'AXJl5oU/PmQ6+nTjwtxIclvLV0OG1lu4a5uAr8MpE1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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