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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f38feae3b7c477090d9da1471c35c72db9071a2ee2546e1a20f841691be8076f' 
  AND token = 'daQ4/kG1p2TTf2K/KS8ge0F3NSkir+x7LnObF+xIb84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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