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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb0ac45104c14fcb34504b0f3f05437b723883a69a6621cbc316050541d2df3' 
  AND token = '8B6bHrKTQ2l2XIAEFs14KiGjzu7qaNwDGQ5kaSKF9ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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