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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a82ba16e3ca5c191f41b12464adaf4113d2681d87ec7b685e8d540faf1abc2b' 
  AND token = 'u7UmIh96lXhxSDH7t5tqNcP/gM5VCANZsqK5N4vDmb4=' 
  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"
    }
  }
}