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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c11eb1cb3ab533b270d299cbeac3c2eeb9efbd77162ff8c7446d0fbc2fe5545' 
  AND token = 'g2ki/FmOCW/FrB1G3IQRi3YlWwvnxXcTc1Y4JT2oVnM=' 
  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"
    }
  }
}