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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd86cade6e55a190c47bd65c5dbf486f8e622a6b6eb300299c1d347fce724352' 
  AND token = 'HUbeewFlUyu3to6iwTpqFAlHDw/+l3fUsI/uBFryk+s=' 
  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"
    }
  }
}