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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03cdd09062ac2295f4d547acf98681aab9c0fc1da1e3eee5731c354041878a60' 
  AND token = 'LF4yC4GouOrgRxB7kmSLd94FA2JPZT2jTv2xxkKoiO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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