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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629e359fbd038eaa879e65cf3bf0de685a163ffac69aead3554ba93709bc4b4a' 
  AND token = 'Ogb61SeMsGPH2Fx8HZN3n0IRS3Wmk+ihnuVyVw/jRK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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