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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ab63dc69c6401e27110046317ea5e1d07075bd39c010cfd975fe993ea9e658' 
  AND token = 'm+r8A1oSIIM7uxGM1pmSiCP5R8EEFtgDeRg2T2XsAnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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