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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97531e73ff35f7106e4c6856f495ada3fa75a4b3b4c18da4d57aa08778f72429' 
  AND token = 'xr5qMBs864i2zpKt161hIdYYdSdQJeHTnCYJ1eMPXhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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